Download or read book Influence des l ments alcalino terreux sur l oxydation du nickel written by Juan José Gonzalez Bajanchi and published by . This book was released on 1995 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: ACTUELLEMENT, LES ALLIAGES RESISTANT A L'OXYDATION A HAUTE TEMPERATURE SONT PROTEGES CONTRE L'OXYDATION PAR LA FORMATION DE COUCHES D'OXYDE CR#2O#3 OU AL#2O#3. L'ADDITION D'ELEMENTS TELS QUE Y, CE, HF DITS ELEMENTS ACTIFS CAR ILS FORMENT DES OXYDES TRES STABLES AMELIORANT LA RESISTANCE A L'OXYDATION DE CES ALLIAGES. LE BUT DU TRAVAIL EFFECTUE ETAIT DE RECHERCHER, POUR LA CROISSANCE DE L'OXYDE NIO, DES ELEMENTS AYANT UNE ACTION SEMBLABLE A CELLE DES ELEMENTS ACTIFS POUR LES COUCHES DE CR#2O#3. SUR LA BASE DES MODELES DEVELOPPES PAR PIERAGGI ET RAPP, LES ELEMENTS ALCALINO-TERREUX ONT ETE CHOISIS CAR ILS FORMENT DES OXYDES THERMODYNAMIQUEMENT TRES STABLES ET PEU SOLUBLES DANS L'OXYDE NIO. LA PARTIE EXPERIMENTALE DU TRAVAIL COMPREND L'ETUDE DE L'OXYDATION DU NICKEL, DU NICKEL REVETU D'UN DEPOT DE NITRATE ALCALINO-TERREUX ET DE NICKEL PASSIVE DANS DES SOLUTIONS DE NITRATE ALCALINO-TERREUX. L'ETUDE DE L'OXYDATION DU NICKEL PUR A PERMIS D'INFIRMER LE MODELE D'ATKINSON BASE SUR LA DIFFUSION INTERGRANULAIRE ET DE MONTRER QUE L'INTERFACE NI-NIO SE DEPLACE AU COURS DE LA CROISSANCE DE NIO, BIEN QUE LA CROISSANCE DE CET OXYDE SOIT CONTROLEE PAR LA DIFFUSION CATIONIQUE. LES DEPOTS DE NITRATE DE CA OU SR SE DECOMPOSENT EN OXYDE CAO OU SRO A PARTIR DE 600C ENVIRON. LES VITESSES D'OXYDATION SONT DIMINUEES D'UN FACTEUR PARFOIS EGAL A 10 ET LA MORPHOLOGIE DES COUCHES D'OXYDE EST MODIFIEE. LES TRAITEMENTS DE PASSIVATION PAR LES SOLUTIONS DE NITRATE ONT UNE ACTION ENCORE PLUS IMPORTANTE. LES CONSTANTES PARABOLIQUES DE VITESSE POUVANT ETRE DEUX ORDRES DE GRANDEUR PLUS FAIBLES QUE DANS LE CAS DU NICKEL NON TRAITE. LES CARACTERISATIONS STRUCTURALES DES COUCHES D'OXYDE ET L'ANALYSE DES CINETIQUES MONTRENT QUE, CONFORMEMENT AU MODELE DE PIERAGGI ET RAPP, L'EFFET DES ALCALINO-TERREUX SUR L'OXYDATION DU NICKEL EST LIEE A LEUR SEGREGATION A L'INTERFACE METAL-OXYDE

Download or read book ETUDE DU MECANISME DE DIFFUSION D IMPURETES DANS UN COLAMINE DE NICKEL NIW NICR INFLUENCE SUR L ADHERENCE D UNE COUCHE D OXYDES ALCALINO TERREUX written by FABIAN.. PORET and published by . This book was released on 2000 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE TRAVAIL EST UNE CONTRIBUTION A LA CARACTERISATION DE L'INTERFACE METAL - TRIPLES OXYDES D'UNE CATHODE A OXYDES. LA SEGREGATION SUPERFICIELLE DU MAGNESIUM ET DE L'ALUMINIUM A ETE ETUDIEE EN COMPARANT DEUX BANDES COLAMINEES D'ALLIAGES DE NICKEL ULTRA-PUR. GRACE A LA MISE EN UVRE DE TECHNIQUES D'ANALYSES COMPLEMENTAIRES : MICROSCOPIE ELECTRONIQUE A BALAYAGE (MEB), SPECTROMETRIE DE MASSE D'IONS SECONDAIRES (SIMS), SPECTROSCOPIE D'ELECTRONS AUGER (AES), MICROSCOPIE ELECTRONIQUE A TRANSMISSION (TEM), ET SPECTROSCOPIE DE DECHARGE LUMINESCENTE (SDL), UN MECANISME DE DIFFUSION A ETE DETERMINE. SOUS L'EFFET D'UN TRAITEMENT THERMIQUE, EN PRESENCE D'UNE FAIBLE PRESSION PARTIELLE D'OXYGENE, LE TRANSPORT DU MAGNESIUM ET DE L'ALUMINIUM VERS LA SURFACE CONDUIT A LA FORMATION DE MICROPRECIPITES D'OXYDES DE MGO PERICLASE, MGAL 2O 4 SPINELLE ET GAMMA-AL 2O 3. CES DERNIERS CRISTALLISENT PRINCIPALEMENT DANS LES JOINTS DE GRAINS. LEUR DENSITE DE REPARTITION EST FONCTION DU MECANISME DE RECRISTALLISATION DU NICKEL. LEUR STABILITE THERMIQUE SOUS VIDE VARIE EN FONCTION DE L'ORIGINE DU METAL DE BASE. LES PLUS STABLES D'ENTRE-DEUX JOUERAIENT UN ROLE DETERMINANT VIS A VIS DE L'ADHERENCE DU REVETEMENT EMISSIF.

Download or read book Influence de la vapeur d eau sur l oxydation haute temp rature des m taux written by Marie-Rose De Nicola and published by . This book was released on 1993 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: BIEN QUE L'ON SACHE DEPUIS LONGTEMPS QUE DES TRACES DE VAPEUR D'EAU PEUVENT MODIFIER LARGEMENT LA CINETIQUE D'OXYDATION DES METAUX, TRES PEU D'ETUDES SYSTEMATIQUES ONT ETE EFFECTUEES. NOUS EXAMINONS DANS CE TRAVAIL LES CAS DU TANTALE, DU TITANE ET DU NICKEL. CES TROIS METAUX ONT ETE CHOISIS PARCE QU'ILS REPRESENTENT ASSEZ BIEN LES DIFFERENTS TYPES DE LOIS CINETIQUES. POUR CHAQUE METAL, UNE ETUDE COMPARATIVE DE L'OXYDATION PAR L'OXYGENE, PAR LA VAPEUR D'EAU ET PAR DES MELANGES OXYGENE-VAPEUR D'EAU A ETE EFFECTUEE. PARALLELEMENT A L'ETUDE CINETIQUE, LES PRODUITS DE REACTION ONT ETE CARACTERISES PAR DIFFERENTES TECHNIQUES. IL APPARAIT QUE LES METAUX CHOISIS A PRIORI, COUVRENT BIEN LES DEUX GRANDS MODES D'INTERVENTION DE LA VAPEUR D'EAU SUR L'OXYDATION: SOIT PAR UNE ACTION SE MANIFESTANT PAR UNE INHIBITION CINETIQUE. C'EST CE QUI A ETE OBSERVE DANS LE CAS DU TANTALE OU L'OXYDE FORME NE SEMBLE PAS ETRE MODIFIE PAR LA PRESENCE DE VAPEUR D'EAU; SOIT PAR UNE ACTION INDUITE SUR LES PROPRIETES DE TRANSPORT DE L'OXYDE FORME, QUI PEUT SE TRADUIRE PAR UNE INHIBITION OU UNE EXACERBATION CINETIQUE. C'EST CE QUI A ETE OBSERVE DANS LE CAS DU TITANE. DES MODIFICATIONS MORPHOLOGIQUES DE LA COUCHE D'OXYDE SONT ALORS MISES EN EVIDENCE. POUR LE NICKEL, LES DEUX TYPES D'ACTION PEUVENT ETRE ENVISAGES

Download or read book High Temperature Corrosion and Protection of Materials 4 written by and published by . This book was released on 1997 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book lectro Magazine written by and published by . This book was released on 1954 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book International Catalogue of Scientific Literature written by and published by . This book was released on 1906 with total page 906 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Analytical Methods in the Nuclear Fuel Cycle written by and published by . This book was released on 1972 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book L Industrie C ramique written by and published by . This book was released on 1962 with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bulletin de documentation, nos. 96-172, included in 1964-1970 volumes.

Download or read book Advances in Uranium Ore Processing and Recovery from Non conventional Resources written by International Atomic Energy Agency and published by Agency. This book was released on 1985 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pandex Current Index to Scientific and Technical Literature written by and published by . This book was released on 1971 with total page 1096 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sustainable Industrial Chemistry written by Fabrizio Cavani and published by John Wiley & Sons. This book was released on 2009-09-22 with total page 621 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years the need for sustainable process design and alternative reaction routes to reduce industry?s impact on the environment has gained vital importance. The book begins with a general overview of new trends in designing industrial chemical processes which are environmentally friendly and economically feasible. Specific examples written by experts from industry cover the possibilities of running industrial chemical processes in a sustainable manner and provide an up-to-date insight into the main concerns, e.g., the use of renewable raw materials, the use of alternative energy sources in chemical processes, the design of intrinsically safe processes, microreactor and integrated reaction/ separation technologies, process intensification, waste reduction, new catalytic routes and/or solvent and process optimization.

Download or read book Radiopharmaceuticals and Labelled Compounds written by and published by . This book was released on 1973 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliography of Mass Spectroscopy Literature for 1972 Compiled by a Computer Method written by and published by . This book was released on 1975 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report covers the year 1972, and lists approximately 10,000 articles of interest to mass spectroscopists. This two-volume report consists of three sections. Vol. II contains the Key Word Out of Context Index (KWOC Index) section. The KWOC Index lists the key words, the reference numbers of the articles in which the key word appears, and the first 100 characters of the title.

Download or read book IBZ kombinierte Folge written by Otto Zeller and published by . This book was released on 1969 with total page 1612 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Uranium Extraction Technology written by International Atomic Energy Agency and published by . This book was released on 1993 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this publication is to update and expand the first edition, which was published in 1983, and to report on later advances in uranium ore processing. It includes background information about the principles of the unit operations used in uranium ore processing and summarizes the current state of the art. Extensive references provide sources for specific technological details.

Download or read book Calcretes written by V. Paul Wright and published by John Wiley & Sons. This book was released on 2009-04-15 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: Calcretes are an important component of many ancient fluvial, lacustrine and shallow-marine carbonate sequences, and they are widely developed in many parts of the world at the present time. Calcretes are useful to the earth scientist involved in reconstructing ancient environments, palaeoclimates and palaeographics, and they may also reveal details of soil biota and chemistry. Over the last two decades the journal Sedimentology has published a number of articles on this subject and a compilation of them is presented here. In addition to the five main sections, this volume also includes an introduction to the subject that offers a review of recent work on calcretes. The collection of papers illustrates the range of calcrete occurrences and the great variety of textures and fabrics. This volume is authored and edited by experts and will serve as more than an introduction to the subject for geologists, soil scientists and geographers. If you are a member of the International Association of Sedimentologists, for purchasing details, please see: http://www.iasnet.org/publications/details.asp?code=RP2

Download or read book World Uranium Geology Exploration Resources and Production written by International Atomic Energy Agency and published by . This book was released on 2020-09-30 with total page 972 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication is a comprehensive contemporary 'one stop' summary and reference volume for world uranium geology and resources allowing insight into potential future uranium discoveries and supply. This is based upon, and updated from, the International Uranium Resource Evaluation Project (IUREP) undertaken by the International Atomic Energy Agency (IAEA) and the Nuclear Energy Agency, Organisation for Economic Cooperation and Development (OECD-NEA) with supporting data from 27 editions of the joint OECD-NEA/IAEA 'Red Book'. For the sake of completeness, this publication also includes a review and comparison of the various outputs of the original IUREP project with new data visualisation incorporating previously difficult to access information, as well as 15 global maps of different uranium deposit types as a separate Annex for download.